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《含瓦斯煤巖圍壓卸荷瓦斯?jié)B流及電荷感應(yīng)試驗(yàn)研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在工程資料-天天文庫(kù)。
1、第34卷第4期巖石力學(xué)與工程學(xué)報(bào)Vol.34No.42015年4月ChineseJournalofRockMechanicsandEngineeringApril,2015含瓦斯煤巖圍壓卸荷瓦斯?jié)B流及電荷感應(yīng)試驗(yàn)研究潘一山,羅浩,李忠華,趙揚(yáng)鋒,肖曉春(遼寧工程技術(shù)大學(xué)力學(xué)與工程學(xué)院,遼寧阜新123000)摘要:煤巖卸荷過(guò)程物理信息監(jiān)測(cè)對(duì)煤與瓦斯突出等動(dòng)力災(zāi)害預(yù)測(cè)研究具有重要意義。應(yīng)用自主研發(fā)的電荷采集裝置,進(jìn)行了含瓦斯煤巖圍壓卸荷瓦斯?jié)B流及電荷感應(yīng)試驗(yàn)。研究結(jié)果表明:含瓦斯煤巖圍壓卸荷過(guò)程中,瓦斯?jié)B流特性及電荷感應(yīng)規(guī)律與煤巖的變形損傷過(guò)程具
2、有十分密切的關(guān)系。隨著圍壓卸荷速率的提高,煤巖內(nèi)部大量微觀裂紋擴(kuò)展,促進(jìn)了煤巖變形損傷,增大了煤巖內(nèi)部裂紋間局部束縛電荷突變?yōu)樽杂呻姾傻母怕?,使得煤巖主破裂過(guò)程產(chǎn)生的感應(yīng)電荷大幅增多;圍壓卸荷減弱了煤巖環(huán)向所受的限制作用,增加了煤巖內(nèi)部新的導(dǎo)氣通道,煤巖滲透率增大。氣體攜帶煤粉顆粒與煤巖孔道固壁間的摩擦作用形成沖流電流,沖流電流對(duì)煤巖電荷信號(hào)貢獻(xiàn)了附加量,使電荷信號(hào)增強(qiáng)。關(guān)鍵詞:采礦工程;含瓦斯煤巖;圍壓卸荷;瓦斯?jié)B流;感應(yīng)電荷;變形損傷中圖分類號(hào):TD713文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000–6915(2015)04–0000–00EXPER
3、IMENTALSTUDYOFGASPERMEABILITYANDCHARGEINDUCTIONUNDERCONFININGPRESSUREUNLOADINGPROCESSOFCONTAINING-GASCOALROCKPANYishan,LUOHao,LIZhonghua,ZHAOYangfeng,XIAOXiaochun(SchoolofMechanicsandEngineering,LiaoningTechnicalUniversity,F(xiàn)uxin123000,China)Abstract:Physicalinformationmonit
4、oringaresignificantforthepredictionofdynamicdisasterssuchascoalandgasoutburstundertheunloadingprocessofcoalrock.Thegaspermeabilityandchargeinductionexperimenthavebeendoneundertheconfiningpressureunloadingofcontaining-gascoalrockbyusingthechargecollectiondeviceindependentlyd
5、eveloped.Theresultsshowthatthegaspermeabilitycharacteristicsandchargeinductionregularitycloselyassociatewiththedeformationdamageintheprocessoftheconfiningpressureunloadingofcontaining-gascoalrock.Withtheincreaseofconfiningpressureunloadingrate,alargenumberofmicrocrackpropag
6、ation,thecoalrockdeformationdamagehasbeenpromoted,themutationprobabilityfrompartialboundchargetofreechargeincreasesintheinternalcracksofcoalrock,theinductivechargehasasignificantincreaseproducedinthemainruptureprocessofcoalrock.Theconfiningpressureunloadingweakensthehoopres
7、trictionsofcoalrock.Newgaschannelsareaddedinsidecoalrockanditmakesthepermeabilityofcoalrockincrease.Streamingcurrentformedbythefrictionactionbetweencoalparticlescarriedbygasandcoalrockholeswall.Itcontributesadditionalamounttothecoalrockchargesignalandenhancesthechargesignal
8、.Keywords:miningengineering;containing-gascoalrock;confiningpressureunloading;gasp